PHP | hash_update_file() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP hash_update_file() Function.

The built-in PHP hash_update_file() function updates the given file content with the hash context.

Syntax

Following below is the syntax to use this function -

hash_update_file ( HashContext $hcontext , string $filename [, resource $scontext = NULL ] ) : bool

READ: PHP | hash_update() Function

Parameter Details

Sr.No	Parameter & Description
1	HashContext context The hash context that you get using hash_init().
2	filename The file path, to get the content to be hashed.
3	scontext Stream context as returned by stream_context_create().

Return Value

This built-in PHP functions returns true or false.

PHP Version

This built-in PHP function works from PHP version greater than 5.1.2.

Example1

Following example illustrates the use of the PHP hash_update_file() function -

<?php
   $hash_context = hash_init('md5');
   file_put_contents('file1.txt', 'Hello World'); 
   // create file file1.txt with content : 'Hello World'
   hash_update_file($hash_context, 'file1.txt');
   echo hash_final($hash_context);
?>

Output

When the above code is executed, it will produce the following result -

b10a8db164e0754105b7a99be72e3fe5

Example2

Following example illustrates the use of the built-in hash_update_file() function with the gost-crypto algo -

<?php
   $hash_context = hash_init('gost-crypto');
   file_put_contents('file1.txt', 'Hello World'); 
   // create file file1.txt with content : 'Hello World'
   hash_update_file($hash_context, 'file1.txt');
   echo hash_final($hash_context);
?>

Output

When the above code is executed, it will produce the following result -

75ed15d84df84291c67fe07bf234ac69e92a9c2a378ee62f342af739e829eba9

READ: PHP | hash_init() Function

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we are going to be studying about the PHP hash_update_stream() Function.

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